Pump



J. V. GIESLER Nov. 2l, 1933.

PUMP

Filed April l0, 1929 4 Sheets-Sheet l lhwentor Nov. 2l, 1933. J. v.GlEsLER 1,936,328

IUMP

Filed April 1o, 1929 4 sheets-sheet 4 Clttorncg Patented Nov. 21, 1933UNITED STATES PUMP Jean V. Giesler, Knoxville, Tenn., assignor to TheFulton Sylphon Company, Knoxville, Tenn., a corporation of DelawareApplication April 10, 1929. Serial No. 354,075

12 Claims.

This invention relates to pumps, and more particularly to fuel feedingpumps adapted for use in the fuel systems of internal combustion enginessuch as automobile engines.

One of the objects of the invention -is to provide a novel pump which isof simple design, economical to manufacture, and efficient and reliablein operation.

Another object is to provide a pump with novel means for effectivelypreventing leakage from the system.

A further object is to provide a novel pump of the reciprocating pistonor plunger type wherein reciprocation of a plunger, piston or otherparts through the casing of the pump is avoided, and the use of packedsliding fits is eliminated.

Other objects will appear, more fully hereinafter as the description ofthe invention proceeds.

Several embodiments of the invention have been n illustrated in theaccompanying drawings, but it is is to be expressly understood that saiddrawings are for purposes of illustration only and are not to beconstrued as a denition of the limits of the invention, reference beinghad to the ap- 25 pended claims for this purpose.

In said drawings,

Fig. 1 is a perspective view of one embodiment of the invention;

Fig. 2 is an elevation in section of the em- 30 bodiment of Fig. 1;

Fig. 3 is a section taken on the line 3 3 of Fig. 2;

Fig. 4 is a perspective view showing part of the elements of Figs. 2 and3;

Fig. 5 is a sectional elevation of another embodim'ent of the invention;

Fig. 6 is a section on the line 6--6 of Fig. 5;

Fig. 7 is a sectional elevation of a further embodiment of theinvention;

Fig. 8 is a section on the line 8-8 of Fig. 7;

Fig. 9 is a sectional elevation of a still further embodiment;

Fig. 10 is a section on the line 10-10 of Fig. 9;

Fig. 1l is a sectional elevation of another embodiment;

Fig. 12 is a section on the line 12-12 of Fig. 11;

Fig. 13 is a sectional elevation of a further embodiment;

Fig. 14 is a section on the line 14-14 of Fig. 13;

Fig. 15 shows another embodiment in sectional elevation; and f Fig. 16is a section on the line 16-16 of Fig. 15.

Referring now to Figs. 1 to 4,l wherein like reference numerals indicatelike parts through- 55 out the several views. a pump casing is providedwhich preferably comprises a cylindrical portion or pump cylinder 1,preferably but not necessarily of metal, and a substantially cylindricalportion of reduced diameter 2. The end of the cylindrical portion 2 isinteriorly threaded to receive a plug 60 3 provided with an opening 4extending therethrough which is threaded for connection to a pipe 5leading to any suitable source of supply (not shown). A suction valve 6of any suitable type cooperates with the opening 4 through the 65 plug3, lifting to admit fuel to the pump casing on suction and closing onpressure Within said casing. Preferably the interior of the cylindricalportion 2 is restricted to form a shoulder '7 immediately above theValve 6, which shoulder limits the movement of the valve disc. A fuelpassage 6 extends through the cylindrical portion 2 of the casingwhereby the fuel is admitted to the pump cylinder l.

A pump piston or plunger 9, of any suitable type, and of any suitablematerial, such as bakelite or other composition or in some instancesmetal, is slidable in the cylinder 1, and is preferably provided withsuitable piston rings 10. Said piston is provided with a central passage11, in s0 open communication with the passage 8 at all times, and avalve disc 12 positioned in a recess 13 in the head of the piston 9cooperates with the passage 11 to open and close the same, the motion ofsaid valve disc being limited by a perforated plaie 14 suitably securedto the piston 9 as by means of screws 15. As the piston 9 movesdownwardly, as seen in the drawings, the valve disc 12 lifts and liquidpasses through the passage ll to the top of the piston 9.

The cylinder 1 is interiorly threaded to'recelve a cap or head 16, thelatter being provided with a cenral opening 17 with which cooperates avalve disc 18. A tubular extension 19 formed on the head 16 surroundsthe opening 17 and 95 valve 18 and is threaded to receive a plug 20, thelatter being provided with a passage 21 which is threaded to receive theend of a discharge pipe 22. As the piston moves upwardly, the valve disc12 is held closed by the pressure of the 100 liquid in the pumpcylinder, the valve 18 opens io discharge the liquid from said cylinder,and the valve 6 opens to admit liquid to the casing below the piston. Onthe succeeding down stroke of the piston, as indicated above, valves 6and 18 105 are closed and valve 12 opened to permit liquid to pass frombelow the piston to above the same.

Means are preferably provided whereby the pison 9 is positively moveddownwardly on the 110 suction stroke and is moved upwardly by a re-lsilient force on the discharge stroke so that the pressure on thedischarge side of the pump will not exceed a predetermined amount. Inthe form shown, the interior of the cylindrical portion 2 of the pumpcasing is recessed to provide a shoulder 23 and a coil spring 24 isseaed on said shoulder and bears against the lower face of the piston 9.'I'he piston 9 is likewise preferably provided with a yoke 25 (Fig. 4),shown as provided with a plurality of lugs 26 imbedded in the piston,said yoke being slidable in the cylindrical portion 2 of the pumpcasing, preferably in grooves 27 which prevent relative rotation betweenthe piston and the pump casing.

Any suitable means may be provided for positively moving the piston andyoke downwardly in the pump casing on the suction stroke of the pump,but such means preferably comprise a pivoted arm or lever having one endengaging in the yoke 25 and the other end extending externally of thepump casing. In the form shown, the cylindrical portion 2 of ihe pumpcasing is provided with an enlarged portion 28 extending to one sidethereof and with a flange 29 to which is suitably secured a plate 30, asby means of screws 31. 'I'he plate 30 is provided with a tubularextension 32 which is threaded to receive a cap 33, and the plate 30 andthe cap 33 are provided with alined openings 34 and 35, respectively,through which extends a short rockshaft 36 constituting the pivot of theoperating lever. The inner end of the shaft 36 carries an arm 37 whicharm is provided at its ex-remity with a pin 38 engaging in the yoke 25.The other end of the shaft 36 carries an arm 39 which may be'operated inany suitable manner to rock the shaft 36 in its bearings. In the formshown, a cam 40 mounted on a cam shaft 41 lifts the arm 39 to depressthe arm 37 and positively move the piston 9 downwardly on the suctionstroke of the pump, a coil spring 42 maintaining the arm 39 inengagement with thecam 40.

Means are provided for preventing leakage around the operating leverwhere it passes through the pump casin'g, such means preferablyincluding a flexible wall maintained in tight sealing engagement withthe operating lever and with a suitable part of the casing. In the formshown y shown in Figs. l to'4, a ange or head 43, to which is attachedone end of a flexible corrugated wall 44, is clamped between the tubularextension 32 and the cap 33. The other end of said exible corrugatedwall is maintained in sealing engagement with the rockshaft 36 in anysuitable manner, but preferably by means of rubbing friction surfaces.To this end, the rockshaft 36 is provided with a collar 46 turning in arecess 45 formed in the bottom of the cup constituted by the tubularextension 32, and a friction washer 47 of any suitable material isinterposed between the bottom of the recess 45 and the collar 46. A

. similar washer 48 is preferably placed adjacent the other face of thecollar 46 and is interposed between said collar and a head 49 to whichthe other end of the flexible corrugated wall 44 is attached. The head49, collar 46, and washers 47 and 48 constitute friction surfaces whichare held in tight engagement by any suitable means such as a coil spring50 interposed between the head 49 and the cap 33.

Another embodiment of the invention is shown in Figs. 5 and 6. In thesegures, the arrangement of the pump casing, fluid passages andcontrolling valves therefor, and the piston ,9, yoke 25,

and spring 24, are substantially the same as described above inconnection with Figs. 1 to 4, inclusive. In this embodiment, however,the rockshaft 36 is omitted and the operating lever comprises a straightrigid arm pivoted intermediate its ends. In this embodiment, therefore,the laterally extending portion 28 of the casing shown in Figs. 1 to 4may be omitted, and a lateral opening 51 formed in the casing for thepassage of the operating lever 52, the latter being suitably pivoted inbrackets 53, preferably formed on the pump casing, as by means of apivot pin 54. 'I'he pump casing is threaded around the opening 51 toreceive a threaded member 55 having an opening 56 through which thelever 52 passes, and leakage from the pump casing through the opening 51is prevented by means of a flexible corrugated wall operatively securedin sealing engagement with the lever 52 and with the pump casing. Asshown, a flexible corrugated wall 57 is attached at one end to a head 58clamped between the member 55 and the casing and at the other end Ato ahead 59 surrounding the operating lever and seated against a collar 60thereon by means of a washer 61 and a nut 62 engaging threads 63 formedon the operating lever 52. As the operating lever 52 is rocked about itspivot by means of the cam 40, the exible wall 57 will be angularlydisplaced but will always seal the pump casing tightly and preventleakage through the opening around the operating lever.

In Figs. 7 and 8, the operating lever 52 is pivoted in brackets 64formed on the cap nut 55 adjacent the opening 56 therein through whichsaid lever extends. In this embodiment, the flexible corrugated wall isreplaced by a diaphragm 65 of any suitable material such as metal,fabric, or,

other alloy or composition, said diaphragm being clamped at itsperiphery between the casing and the cap nut 55. The operating lever 52extends through said diaphragm, which is provided with a ange 66 closelysurrounding said lever and secured thereto in any suitable manner as bysoldering or brazing, to form a tight seal. 'Ihe diaphragm is preferablysecured to the lever closely adjacent the pivot of the latter, so thatthere is suflicient flexibility in the diaphragm for the angulardisplacement ol' the lever about its pivot.

In Figs. 9 and 10, the lever 52 is suitably pivoted between brackets 67formed on the cap nut 55, and is surrounded by a flexible corrugatedwall 69 having one of its ends attached to the head 7.0 which is clampedbetween the casing and the cap nut. -The other end of said flexible wallis suitably attached to the head 71 surrounding the lever 52 and seatedagainst a shoulder 72 thereon by means of a washer 73 and nut 74engaging threads 75 formed on said operating lever.

In Figs. 11 and 12, the lever 52 is pivoted in any suitable manner inbrackets 76 formed on the cap nut 55, as by means of a pivot pin 77, anda corrugated diaphragm 78 is clamped at its periphery between the casingand the cap nut and is provided at its center with a flange 79surrounding and secured in any suitable manner to the lever 52 as bysoldering or brazing. l

In Figs. 13 and 14, the operating lever 52 is suitably pivoted inbrackets 80 formed on the rcap nut 55, as by means of a pivot pin 81,and

is surrounded by a tube 82 of suitable flexible material preferablyhaving the same cross sectional form as said lever. One end of the tube82 is secured to said lever in any suitable manner, as by soldering orbrazing, at 83, while the other 9nd of said tube surrounds the bracket80 and pivot pin 81 and is provided with a ilange 84 suitably secured tothe cap nut as by soldering or brazing.

In Figs. 15 and 16, the operating lever 52 is suitably pivoted inbrackets 85 formed on the cap nut 55, as by means of a pivot pin 86, andsaid lever is surrounded by a ilexible wall within which the lever isfree to move. In the form shown, a tube 87, preferably having the samecross sectional form as the lever 52, surrounds the inner portion ofsaid lever and the inner end of said tube is closed by a cap 88preferably soldered or brazed thereto. The other end of the tube 87 isprovided with a flange 89 which is suitably secured as by soldering orbrazing to a head 90 through which the lever 52 passes freely. One endof a ilexible corrugated wall 91 is secured in any suitable manner tosaid head 90, and the other end of said wall 91 is secured to a head 92which is clamped between the casing and the cap nut 55.

It will be seen that in each of the embodiments of the invention shown,the use of members reciprocating through the casing is avoided and thenecessity for packed sliding fits is eliminated by the use of a pivotedarm or lever having one end within the casing operatively engaging thepiston and the other end without the same. In such a case, it isnecessary only to prevent leakage past a member having a limited rangeof pivotal movement, and this may readily be accomplished by the use ofdiaphragms or flexible walls of metal or fabric or any suitable materialwhich may be permanently secured in sealing engagement with the partsand yet possess suicient flexibility to allow for the required movementof the operating lever.

Moreover, leakage past the piston during the pumpingstroke is eliminatedas a source of trouble by the use oftwo suction valves, one onthesuction side of the piston and the other in the casing which enclosessaid piston, whereby any leakage past the piston is retained within thecasing and may be employed on the next pumping stroke of the piston. Theentire pump is of simple construction and requires few parts, so that itcan be economically manufactured in quantities, while at the same timeit is very eilicient and reliable in operation and owing to theadvantages afforded by the above noted features, is practically freefrom all objection on the ground of leakage of iluid from the casing.

While several embodiments of the invention have been described andillustrated in the drawings, it will be apparent to those skilled in theart that the invention is capable of a wide variety of mechanicalexpressions, while changes may be made in the form, details andproportions of the parts without departing from the spirit of theinvention. Reference is therefore to be had to the appended claims for adefinition of the limits of the invention.

What is claimed is:

1. A device of the class described comprising a casing, suction anddischarge valves associated with said casing, a plunger wholly withinand slidable in said casing between said valves, said plunger having apassage therethrough, a valve for said passage, a lever having a one-waydriving engagement with said plunger within said casing and extendingthrough said casing. a ilexible wall surrounding said lever exteriorlyof its engagement with said plunger and connected to said casing toprevent leakage therefrom, means external to said casing for operatingsaid lever to move said plunger in one direction, and resilient meanswithin said casing for moving said plunger in the opposite direction.

2. A device of the class described comprising a casing, suction anddischarge valves associated with said casing, a plunger wholly withinand slidable in said casing between said valves, said plunger having apassage therethrough, a valve for said passage, a lever having a one-waydriving engagement with said plunger within said casing and extendingthrough said casing, a ilexible corrugated wall surrounding said leverexteriorly of its engagement with said plunger and in sealing engagementwith said lever and casing, means external to said casing for rotatingsaid lever about its pivot to move said plunger in one direction, andresilient means Within said casing tensioned by movement of said plungerin said one direction and tending to move said plunger in the oppositedirection.

3. A device of the class described comprising a casing having a pumpcylinder and a portion of smaller diameter communicating therewith,suction and discharge valves associated with said casing, a plungerslidable in said cylinder, said plunger having a passage therethrough, avalve for said passage, a yokefon said piston slidably engaged in saidportion of smaller diameter, said plunger and yoke being wholly withinsaid casing, a lever having a one-way driving engagement with said yokeWithin said portion of smaller diameter and extending through saidcasing, a flexible wall surrounding said lever in sealing engagementwith said lever and casing, means external to said casing for rotatingsaid lever about its pivot to move said plunger in one direction, saidportion of smaller diameter having a shoulder therein, and a compressionspring interposed between said shoulder and said plunger.

4. A device of the class described comprising a casing having a pumpcylinder and a portion of a smaller diameter communicating therewith, adischarge valve in the wall of said cylinder, a suction valve in thewall of said portion of smaller diameter, a plunger slidable in saidcylinder between said valves, said plunger having a passagetherethrough, a valve for said passage adapted to pass liquid from thesuction side to the discharge side of said plunger, a yoke on saidpiston slidably engaged in said portion of smaller diameter, saidplunger and yoke being wholly within said casing, said portion ofsmaller diameter having a lateral opening in its wall, a lever having aoneway driving engagement with said yoke within said portion of smallerdiameter and extending through said opening, a flexible wall surroundingsaid lever and connected to said casing to seal' said opening againstleakage, means external to said casing for rotating said lever about itspivot to move said plunger in one direction, and resilient means withinsaid casing tensioned by movement of said plunger in one direction andtending to move said plunger in the opposite direction.

5. A device of the class described comprising a casing, suction anddischarge valves associated with said casing, a plunger wholly withinand slidable in said casing, a rockshaft having a pair of arms, one ofsaid arms being inside of said casing and one of said arms being outsideo! said casing, and having a one-way driving engagement with saidplunger within a chamber of said casing that contains the uid beingpumped therethrough, a ilexible wall cooperating with said rockshaft andsaid casing to prevent leakage said plunger in one direction.

6. A device of the class described comprising a casing, suction anddischarge valves associated with said casing, a plunger wholly withinand slidable in said casing, a rock shaft extending from the inside tothe outside of said casing, an arm on said shaft projecting into achamber in said casing through which passes the iluid being pumped andhaving a one-way driving engagement with said plunger, an arm on saidshaft external to said casing, means operatively engaging said externalarm to move said plunger in one direction, resilient means within saidcasing to move said plunger in the opposite direction, a exible wallsurrounding said shaft and sealed to said casing, and means includingcooperating friction surfaces for maintaining a fluid-tight jointbetween said wall and shaft.

.7. A device of the class described comprising a c g, suction anddischarge valves associated wi said casing, a plunger slidable in saidcasing, a slotted yoke on said plunger, said plunger dividing theinterior of said casing into receiving and pumping chambers, avalve-controlled passage through said plunger, a rock shaft extendingfrom the inside to the outside of said casing, an arm on said shaftwithin said casing having a one-way driving engagement with one end ofthe slot in said yoke, an arm on said shaft external to said casing,means operatively engaging said external arm to move said plunger in onedirection, resilient means within said casing to move said plunger inthe opposite direction, and a flexible wall surrounding said shaft andsealed to said shaft and casing.

8. A device of the class described comprising a casing having a pumpcylinder and a portion of smaller diameter communicating therewith,suction and discharge valves associated with said casing, a plungerslidable in said cylinder, said plunger having a passage therethrough, avalve for said passage, a shoulder in said portion of smaller diameter,a coil spring interposed between said shoulder and said piston, a yokeon said piston slidably engaged in said portion of smaller diameter, arock shaft extending through said casing, an arm on said shaft withinsaid casing having a one-way driving engagement with said yoke, an armon said shaft external to said casing, means operatively engaging saidexternal arm to move said plunger in one direction against the tensionof said spring, and a exible wall surrounding said shaft and sealed tosaid casing. A

9. A device of the class described comprising a casing having a lateralopening therein, suction and discharge valves associated with saidcasing, a plunger slidable in said casing between said valves, saidplunger having a passage therethrough, a valve for said passage, a leverhaving a one-way driving engagement with said plunger within said casingand extending through said opening, means mounted on said casing orpivoting said lever, a flexible diaphragm surrounding said lever in saidopening and sealed to said lever and casing respectively, means externalto said casing for operating said lever to a casing. Suction anddischarge valves associ- Y ated with said casing, a plunger slidable insaid casing between said valves, said plunger having a passagetherethrough, a valve for said passage, a lever having a one-way drivingengagement with said plunger and extending through said casing, a exibletube surrounding said lever and sealed at its ends to said lever andcasing respectively, means external to said casing for operating saidlever to move said plunger in one direction, and resilient means withinsaid casing for moving said plunger in the opposite direction.

l1. A mechanically driven fuel pump for delivering fuel at a constantpressure independent of the speed of the driving means comprising a pumpcasing having a chamber therein, independent inflow and outflowconnections to said y casing for flow of the fuel through said chamber,a reciprocable pump plunger movable in said chamber and dividing saidchamber into an expansible and reducible pumping chamber and an anteriorfuel receiving chamber, valve means preventing return flow into saidpumping chamber from said outflow connection, means permitting iiow ofthe fuel in one direction from said fuel receiving chamber past saidreciprocable pump plunger and into said pumping chamber, a iiexiblediaphragm secured in sealing relation to said pump casing and forming awall of said fuel receiving chamber, an operating member extendingthrough said diaphragm and secured inl sealing relation thereto, a lostmotion connection between said operating member and said pump plungerwithin said fuel receiving chamber, resilient means within said fuelreceiving chamber normally effective to vprevent lost motion between'said operating member and said pump plunger and serving to limit theeffective discharge pressure by permitting a variable discharge strokeof 'said pump plunger and driving means adapted to. engage saidoperating member on the exterior of said fuel receiving chamber. v

12. A mechanically driven fuel pump comprisving a pump casing having achamber therein, a

reciprocable pumping member dividing said chamber into a pumping chamberand a fuel receiving chamber, a' valve controlled outflow passage fromthe `pumping chamber, an inflow passage to said fuel receiving chamber,a flexible diaphragm secured in sealing relation to said casing andforming a wall of said fuel receiving chamber, an operating membersecured in sealing relation to said diaphragm and extendingtherethrough, a lost motion connection within said fuel receivingchamber between said operating member and said pumping member, aresilient compression spring cooperating with said pumping member andserving to limit the effective discharge stroke of said pumping member,means for positively moving said operating member in one direction andresilient means operative to return said operating member in the op-

